Spring post方法“缺少所需的请求正文”

Question

@PostMapping(path="/login")
public ResponseEntity<User> loginUser(@RequestBody Map<String, String> userData) throws Exception {
    return ResponseEntity.ok(userService.login(userData));
}

我在 UserController 中有这个登录方法。问题是当我尝试为登录发出 post 请求时，我收到此错误：

{
"timestamp": "2018-10-24T16:47:04.691+0000",
"status": 400,
"error": "Bad Request",
"message": "Required request body is missing: public org.springframework.http.ResponseEntity<org.scd.model.User> org.scd.controller.UserController.loginUser(java.util.Map<java.lang.String, java.lang.String>) throws java.lang.Exception",
"path": "/users/login"
}

---

Answer 1

如果是 POST 请求，则必须将其作为 JSON 传递到正文中。

Answer 2

我遇到了类似的问题，在我的 Spring Boot 服务中遇到此错误

HttpMessageNotReadableException：缺少必需的请求正文：...

我的问题是，当我从Postman发出请求时，“Content-Length”标头未选中，因此服务不考虑请求正文。

Answer 3

This is happening because you are not passing a body to you server. As can I see in your screenshot you are passing email and password as a ResquestParam.

To handle this values, you can do the following:

@PostMapping(path="/login")
public ResponseEntity<User> loginUser(@RequestParam("email") String email, @RequestParam("password") String password) {
     //your imp
}

In order to accept an empty body you can use the required param in the RequestBody annotation:

@RequestBody(required = false)

But this will not solve your problem. Receiving as RequestParam will.

If you want to use RequestBody you should pass the email and password in the body.